Valved catheters including high flow rate catheters
View Patent ↗A pressure activated two-way slit valve assembly is designed to be used in combination with, but not limited to, a high flow rate catheter to prevent accidental ingestion of air or loss of blood if the closure cap comes off during non-use of the catheter. In addition, the potential for occlusion of the catheter due to blood clots in the catheter and catheter related infection is substantially reduced. The pressure activated two-way slit valve assembly includes a first end, a second end, a wall defining a dumbbell shaped channel, and a flexible, thin disk having a slit and positioned within the pressure activated two-way slit valve assembly to reside within the dumbbell shaped channel. The slit and the dumbbell shaped channel are sized to enable the slit to deform in response to a predetermined pressure differential across the slit to allow fluid to pass therethrough.
1. A pressure activated two-way slit valve assembly for a catheter, the pressure activated two-way slit valve assembly comprising: a first end; a second end; a wall extending between the first end and the second end, the wall defining a dumbbell shaped channel, wherein the dumbbell shaped channel has a dumbbell shaped cross-section perpendicular to a longitudinal axis of the pressure activated two-way slit valve assembly, located between the first end and the second end; a flexible, thin disk comprising a slit, the flexible, thin disk disposed within the pressure activated two-way slit valve assembly such that the slit is substantially perpendicular to the longitudinal axis of the pressure activated two-way slit valve assembly and resides within the dumbbell shaped channel with a first dumbbell shaped portion of the dumbbell shaped channel proximal to the disk and a second dumbbell shaped portion of the dumbbell shaped channel distal thereto, wherein the slit and the dumbbell shaped channel are sized to enable the slit to deform in response to a predetermined pressure differential across the slit to allow fluid to pass therethrough.
2. The pressure activated two-way slit valve assembly of claim 1 wherein the wall further defines connection ports located at the first end and the second end, the connection ports being in fluid communication with the dumbbell shaped channel.
3. The pressure activated two-way slit valve assembly of claim 2 wherein the first end comprises a barbed ending for attaching to a catheter.
4. The pressure activated two-way slit valve assembly of claim 2 wherein the second end comprises a luer ending for attaching to one of a dialysis machine and an end cap.
5. The pressure activated two-way slit valve assembly of claim 1 wherein the slit comprises an H-shape.
6. The pressure activated two-way slit valve assembly of claim 1 wherein the slit comprises a saw-tooth wave shape.
7. The pressure activated two-way slit valve assembly of claim 1 further comprising a safety rotatable valve key.
8. The pressure activated two-way slit valve assembly of claim 7 wherein the safety rotatable valve key is attached to the second end.
9. A medical device comprising: a catheter comprising a distal end, a proximal end, and a housing defining at least one or more lumens extending between the distal end and the proximal end, the distal end being open, the proximal end including a pressure activated two-way slit valve assembly comprising a first end, a second end, a wall extending between the first end and the second end, the wall defining a dumbbell shaped channel, wherein the dumbbell shaped channel has a dumbbell shaped cross-section perpendicular to a longitudinal axis of the pressure activated two-way slit valve assembly, located between the first end and the second end and a flexible, think disk comprising a slit, the flexible, thin disk disposed within the pressure activated two-way slit valve assembly such that the slit is substantially perpendicular to the longitudinal axis of the pressure activated two-way slit valve assembly and resides within the dumbbell shaped channel with a first dumbbell shaped portion of the dumbbell shaped channel proximal to the disk and a second dumbbell shaped portion of the dumbbell shaped channel distal Thereto, wherein the slit and the dumbbell shaped channel are sized to enable the slit to deform in response to a predetermined pressure differential across the slit to allow fluid to pass therethrough.
10. The medical device of claim 9 wherein the wall of the pressure activated two-way slit valve assembly further defines connection ports located at the first end and the second end, the connection ports being in fluid communication with the dumbbell shaped channel.
11. The medical device of claim 9 wherein the slit of the pressure activated two-way slit valve assembly comprises an H-shape.
12. The medical device of claim 9 wherein the slit of the pressure activated two-way slit valve assembly comprises a saw-tooth wave shape.
13. The medical device of claim 9 wherein the pressure activated two-way slit valve assembly further comprises a safety rotatable valve key.
14. The medical device of claim 13 wherein the safety rotatable valve key is attached to the second end of the pressure activated two-way slit valve assembly.
15. The medical device of claim 9 wherein the housing of the catheter is coated with an anti-infective coating to inhibit bacteria growth.
16. A valved dialysis catheter comprising: an open-ended multi-lumen catheter including at least one lumen for withdrawing blood form a patient for dialysis and at least one lumen for returning blood from a dialysis machine to the patient, each lumen of the open-ended multi-lumen catheter including a pressure activated two-way slit valve assembly comprising a first end connected to the open-ended multi-lumen catheter, a second end connectable to a dialysis machine, a wall extending between the first end and the second end, the wall defining a dumbbell shaped channel, wherein the dumbbell shaped channel has a dumbbell shaped cross-section perpendicular to a longitudinal axis of the pressure activated two-way valve assembly, located between the first end and the second end and a flexible, thin disk comprising a slit, the flexible, thin disk disposed within the pressure activated two-way slit valve assembly such that the slit is substantially perpendicular to the longitudinal axis of the pressure activated two-way slit valve assembly and resides within the dumbbell shaped channel with a first dumbbell shaped portion of the dumbbell shaped channel proximal to the disk and a second dumbbell shaped portion of the dumbbell shaped channel distal thereto, wherein the slit and the dumbbell shaped channel are sized to enable the slit to deform in response to a predetermined pressure differential across the slit to allow fluid to pass therethrough.
17. The valved dialysis catheter of claim 16 wherein the wall of the pressure activated two-way slit valve assembly further defines connection ports located at the first end and the second end, the connection ports being in fluid communication with the dumbbell shaped channel.
18. The valved dialysis catheter of claim 17 wherein the first end of the pressure activated two-way slit valve assembly comprises a barbed ending.
19. The valved dialysis catheter of claim 17 wherein the second end of the pressure activated two-way slit valve assembly comprises a luer ending.
20. The valved dialysis catheter of claim 16 wherein the slit of the pressure activated two-way slit valve assembly comprises an H-shape.
21. The valved dialysis catheter of claim 16 wherein the slit of the pressure activated two-way slit valve assembly comprises a saw-tooth wave shape.
22. The valved dialysis catheter of claim 16 wherein the pressure activated two-way slit valve assembly further comprises a safety rotatable valve key.
23. The valved dialysis catheter of claim 16 wherein the open-ended multi-lumen catheter further comprises an anti-infective external surface.
24. A method for preventing air ingestion in a valved catheter, the method comprising the steps of: providing a catheter comprising a distal end, and a housing defining at least one or more lumens extending between the distal end and the proximal end, the distal end being open, the proximal end including a pressure activated two-way slit valve assembly comprising a first end, a second end, a wall extending between the first end and the second end and a flexible, thin disk comprising a slit, the flexible, thin disk disposed within the pressure activated two-way slit valve assembly such that the slit is substantially perpendicular to a longitudinal axis of the pressure activated two-way slit valve assembly and resides within the dumbbell shaped channel, wherein the dumbbell shaped channel has a dumbbell shaped cross-section perpendicular to the longitudinal axis of the pressure activated two-way slit valve assembly, with a first dumbbell shaped portion of the dumbbell shaped channel proximal to the disk and a second dumbbell shaped portion of the dumbbell shaped channel distal thereto, wherein the slit and the dumbbell shaped channel are sized to enable the slit to deform in response to a predetermined pressure differential across the slit to allow fluid to pass therethrough; and inserting the distal end of the catheter within a blood vessel.
25. The method of claim 24 wherein the predetermined pressure differential is between about 50 cm of water to about 120 cm of water.
26. The method of claim 24 wherein the predetermined pressure differential is between about 80 cm of water to about 120 cm of water.